Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises six lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

INCORPORATION BY REFERENCE

This application claims priority from P.R.C. Patent Application No.201410159368.2, filed on Apr. 18, 2014, P.R.C. Patent Application No.201410158290.2, filed on Apr. 18, 2014, P.R.C. Patent Application No.201410159396.4, filed on Apr. 18, 2014 and P.R.C. Patent Application No.201410249205.3, filed on Jun. 6, 2014, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and particularly, relates to a mobile device applying anoptical imaging lens having six lens elements and an optical imaginglens thereof.

BACKGROUND

The ever-increasing demand for smaller sized mobile devices, such ascell phones, digital cameras, etc. correspondingly triggered a growingneed for a smaller sized photography module, comprising elements such asan optical imaging lens, a module housing unit, and an image sensor,etc., contained therein. Size reductions may be contributed from variousaspects of the mobile devices, which includes not only the chargecoupled device (CCD) and the complementary metal-oxide semiconductor(CMOS), but also the optical imaging lens mounted therein. When reducingthe size of the optical imaging lens, however, achieving good opticalcharacteristics becomes a challenging problem.

The length of conventional optical imaging lenses comprising four lenselements can be limited in a certain range; however, as the more andmore demands in the market for high-end products, high-standard opticalimaging lenses which show great quality with more pixels are required.

The major structure of conventional optical imaging lenses is thosehaving four lens elements which length is short due to the few lenselements; however, those having six lens elements are getting welcome inthe market for its better imaging quality and more pixels which maysatisfy the requirements of high-end products. Sadly, according tocurrent technological development, such as the optical imaging lenses inU.S. Pat. Nos. 7,663,814 and 8,040,618, both of which disclosed anoptical imaging lens constructed with an optical imaging lens having sixlens elements, the length of the optical imaging lens, from theobject-side surface of the first lens element to the image plane,exceeds 21 mm. These optical imaging lenses are too long for smallersized mobile devices.

Therefore, there is needed to develop optical imaging lens which iscapable to place with six lens elements therein, with a shorter length,while also having good optical characteristics.

SUMMARY

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. With controlling the convex or concaveshape of the surfaces and at least one inequality, the length of theoptical imaging lens is shortened and meanwhile the good opticalcharacteristics, and system functionality are sustained.

In an exemplary embodiment, an optical imaging lens comprises,sequentially from an object side to an image side along an optical axis,comprises first, second, third, fourth, fifth and sixth lens elements,each of the first, second, third, fourth, fifth and sixth lens elementshaving refracting power, an object-side surface facing toward the objectside and an image-side surface facing toward the image side and acentral thickness defined along the optical axis.

In the specification, parameters used here are: the central thickness ofthe first lens element, represented by T1, an air gap between the firstlens element and the second lens element along the optical axis,represented by G12, the central thickness of the second lens element,represented by T2, an air gap between the second lens element and thethird lens element along the optical axis, represented by G23, thecentral thickness of the third lens element, represented by T3, an airgap between the third lens element and the fourth lens element along theoptical axis, represented by G34, the central thickness of the fourthlens element, represented by T4, an air gap between the fourth lenselement and the fifth lens element along the optical axis, representedby G45, the central thickness of the fifth lens element, represented byT5, an air gap between the fifth lens element and the sixth lens elementalong the optical axis, represented by G56, the central thickness of thesixth lens element, represented by T6, a distance between the image-sidesurface of the sixth lens element and the object-side surface of afiltering unit along the optical axis, represented by G6F, the centralthickness of the filtering unit along the optical axis, represented byTF, a distance between the image-side surface of the filtering unit andan image plane along the optical axis, represented by GFP, a focusinglength of the first lens element, represented by f1, a focusing lengthof the second lens element, represented by f2, a focusing length of thethird lens element, represented by f3, a focusing length of the fourthlens element, represented by f4, a focusing length of the fifth lenselement, represented by f5, a focusing length of the sixth lens element,represented by f6, the refracting index of the first lens element,represented by n1, the refracting index of the second lens element,represented by n2, the refracting index of the third lens element,represented by n3, the refracting index of the fourth lens element,represented by n4, the refracting index of the fifth lens element,represented by n5, the refracting index of the sixth lens element,represented by n6, an abbe number of the first lens element, representedby v1, an abbe number of the second lens element, represented by v2, anabbe number of the third lens element, represented by v3, an abbe numberof the fourth lens element, represented by v4, an abbe number of thefifth lens element, represented by v5, an abbe number of the sixth lenselement, represented by v6, an effective focal length of the opticalimaging lens, represented by EFL, a distance between the object-sidesurface of the first lens element and an image plane along the opticalaxis, represented by TTL, a sum of the central thicknesses of all sixlens elements, i.e. a sum of T1, T2, T3, T4, T5 and T6, represented byALT, a sum of all five air gaps from the first lens element to the sixthlens element along the optical axis, i.e. a sum of G12, G23, G34, G45and G56, represented by AAG, and a back focal length of the opticalimaging lens, which is defined as the distance from the image-sidesurface of the sixth lens element to the image plane along the opticalaxis, i.e. a sum of G6F, TF and GFP, and represented by BFL.

In an aspect of the present invention, in the optical imaging lens, theimage-side surface of the first lens comprises a convex portion in avicinity of the optical axis; the second lens element is constructed byplastic material; the image-side surface of the third lens elementcomprises a concave portion in a vicinity of the optical axis; theobject-side surface of the fourth lens element comprises a concaveportion in a vicinity of the optical axis; the image-side surface of thefifth lens element comprises a convex portion in a vicinity of aperiphery of the fifth lens element; the object-side surface of thesixth lens element which is constructed by plastic material comprises aconvex portion in a vicinity of the optical axis, and the image-sidesurface thereof comprises a concave portion in a vicinity of the opticalaxis; the optical imaging lens comprises no other lenses havingrefracting power beyond the six lens elements; and the central thicknessof the second lens element is represented by T2, a sum of all five airgaps from the first lens element to the sixth lens element along theoptical axis is represented by AAG, and T2 and AAG satisfy the equation:AAG/T2≦4.3  Equation (1).

In another exemplary embodiment, other equation(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example, T3, T6 and G34 could be controlled tosatisfy at least one of the equations as follows:(T3+T6)/G34≦4.5  Equation (2); or1.2≦(T3+T6)/G34≦4.5  Equation (2′); or

G34 and AAG could be controlled to satisfy the equation as follows:AAG/G34≦3  Equation (3); or

G12, G23, G45 and ALT could be controlled to satisfy the equation asfollows:6.5≦ALT/(G12+G23+G45)  Equation (4); or

T1, T4, T5 and G34 could be controlled to satisfy at least one of theequations as follows:(G34+T1+T5)/T4≦4  Equation (5); or(G34+T1+T5)/T4≦3  Equation (5′); or

T1, T4 and T5 could be controlled to satisfy the equation as follows:(T1+T5)/T4≦2.8  Equation (6); or

T2, G12, G23 and G45 could be controlled to satisfy the equation asfollows:(G12+G23+G45)/T2≦2.1  Equation (7); or

T4, T5 and G34 could be controlled to satisfy the equation as follows:(G34+T5)/T4≦2.2  Equation (8); or

G12, G23, G45, G56 and AAG could be controlled to satisfy the equationas follows:1.6≦AAG/(G12+G23+G45+G56)  Equation (9); or

G12, G23, G34 and G45 could be controlled to satisfy the equation asfollows:(G12+G23+G45)/G34≦2.1  Equation (10); or

T1, T5 and G34 could be controlled to satisfy the equation as follows:1.8≦(T1+T5)/G34≦6  Equation (11);or

T4, G12, G23 and G45 could be controlled to satisfy the equation asfollows:2.1≦T4/(G12+G23+G45)  Equation (12);or

T3, T4 and T6 could be controlled to satisfy the equation as follows:(T3+T6)/T4≦2.1  Equation (13); or

T2, T5 and G34 could be controlled to satisfy the equation as follows:2.5≦(G34+T5)/T2  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

In some exemplary embodiments, more details about the convex or concavesurface structure could be incorporated for one specific lens element orbroadly for plural lens elements to enhance the control for the systemperformance and/or resolution, for example, the image-side surface ofthe sixth lens element may comprise a further convex portion in avicinity of a periphery of the sixth lens element. It is noted that thedetails listed here could be incorporated in example embodiments if noinconsistency occurs.

In another exemplary embodiment, a mobile device comprising a housingand a photography module positioned in the housing is provided. Thephotography module comprises any of aforesaid example embodiments ofoptical imaging lens, a lens barrel, a module housing unit and an imagesensor. The lens barrel is for positioning the optical imaging lens, themodule housing unit is for positioning the lens barrel, and the imagesensor is positioned at the image side of the optical imaging lens.

Through controlling the convex or concave shape of the surfaces and atlease one inequality, the mobile device and the optical imaging lensthereof in exemplary embodiments achieve good optical characteristicsand effectively shorten the length of the optical imaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of one single lens element according tothe present disclosure;

FIG. 2 is a cross-sectional view of a first embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 3 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 4 is a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 5 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 6 is a cross-sectional view of a second embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according to the present disclosure;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosure;

FIG. 9 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 is a cross-sectional view of a third embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosure;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosure;

FIG. 13 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosure;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosure;

FIG. 17 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosure;

FIG. 21 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a sixth embodiment of the present disclosure;

FIG. 25 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 is a cross-sectional view of a seventh embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 27 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a seventh embodiment of the optical imaginglens according to the present disclosure;

FIG. 28 is a table of optical data for each lens element of a seventhembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 is a table of aspherical data of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 is a cross-sectional view of a eighth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 31 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a eighth embodiment of the optical imaginglens according to the present disclosure;

FIG. 32 is a table of optical data for each lens element of the opticalimaging lens of a eighth embodiment of the present disclosure;

FIG. 33 is a table of aspherical data of a eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 34 is a cross-sectional view of a ninth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 35 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a ninth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 36 is a table of optical data for each lens element of the opticalimaging lens of a ninth embodiment of the present disclosure;

FIG. 37 is a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 38 is a table for the values of T1, G12, T2, G23, T3, G34, T4, G45,T5, G56, T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL, AAG/T2, (T3+T6)/G34,AAG/G34, ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4,(G12+G23+G45)/T2, (G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34,(T1+T5)/G34, T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of all nineexample embodiments;

FIG. 39 is a structure of an example embodiment of a mobile device;

FIG. 40 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Here in the present specification, “a lens element having positiverefracting power (or negative refracting power)” means that the lenselement has positive refracting power (or negative refracting power) inthe vicinity of the optical axis. “An object-side (or image-side)surface of a lens element comprises a convex (or concave) portion in aspecific region” means that the object-side (or image-side) surface ofthe lens element “protrudes outwardly (or depresses inwardly)” along thedirection parallel to the optical axis at the specific region, comparedwith the outer region radially adjacent to the specific region. TakingFIG. 1 for example, the lens element shown therein is radially symmetricaround the optical axis which is labeled by I. The object-side surfaceof the lens element comprises a convex portion at region A, a concaveportion at region B, and another convex portion at region C. This isbecause compared with the outer region radially adjacent to the region A(i.e. region B), the object-side surface protrudes outwardly at theregion A, compared with the region C, the object-side surface depressesinwardly at the region B, and compared with the region E, theobject-side surface protrudes outwardly at the region C. Here, “in avicinity of a periphery of a lens element” means that in a vicinity ofthe peripheral region of a surface for passing imaging light on the lenselement, i.e. the region C as shown in FIG. 1. The imaging lightcomprises chief ray Lc and marginal ray Lm. “In a vicinity of theoptical axis” means that in a vicinity of the optical axis of a surfacefor passing the imaging light on the lens element, i.e. the region A asshown in FIG. 1. Further, a lens element could comprise an extendingportion E for mounting the lens element in an optical imaging lens.Ideally, the imaging light would not pass the extending portion E. Herethe extending portion E is only for example, the structure and shapethereof are not limited to this specific example. Please also noted thatthe extending portion of all the lens elements in the exampleembodiments shown below are skipped for maintaining the drawings cleanand concise.

In the present invention, examples of an optical imaging lens which is aprime lens are provided. Example embodiments of an optical imaging lensmay comprise a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement, each of the lens elements comprises refracting power, anobject-side surface facing toward an object side and an image-sidesurface facing toward an image side and a central thickness definedalong the optical axis. These lens elements may be arranged sequentiallyfrom the object side to the image side along an optical axis, andexample embodiments of the lens may comprise no other lenses havingrefracting power beyond the six lens elements. In an example embodiment:the image-side surface of the first lens comprises a convex portion in avicinity of the optical axis; the second lens element is constructed byplastic material; the image-side surface of the third lens elementcomprises a concave portion in a vicinity of the optical axis; theobject-side surface of the fourth lens element comprises a concaveportion in a vicinity of the optical axis; the image-side surface of thefifth lens element comprises a convex portion in a vicinity of aperiphery of the fifth lens element; the object-side surface of thesixth lens element which is constructed by plastic material comprises aconvex portion in a vicinity of the optical axis, and the image-sidesurface thereof comprises a concave portion in a vicinity of the opticalaxis; the optical imaging lens comprises no other lenses havingrefracting power beyond the six lens elements; and the central thicknessof the second lens element is represented by T2, a sum of all five airgaps from the first lens element to the sixth lens element along theoptical axis is represented by AAG, and T2 and AAG satisfy the equation:AAG/T2≦4.3  Equation (1).

Preferably, the lens elements are designed in light of the opticalcharacteristics and the length of the optical imaging lens. For example,combining the convex portion in a vicinity of the optical axis formed onthe image-side surface of the first lens element, the concave portion ina vicinity of the optical axis formed on the image-side surface of thethird lens element, the concave portion in a vicinity of the opticalaxis formed on the object-side surface of the fourth lens element, theconvex portion in a vicinity of a periphery of the fifth lens elementformed on the image-side surface thereof, the convex portion in avicinity of the optical axis formed on the object-side surface of thesixth lens element and the concave portion in a vicinity of the opticalaxis formed on the image-side surface of the sixth lens element mayassist in collecting light, the aberration of the optical imaging lenscould be adjusted to promote the imaging quality of the optical imaginglens. Additionally, combining above features with the convex portion ina vicinity of a periphery of the sixth lens element formed on theimage-side surface thereof, the aberration of the optical imaging lenscould be further adjusted. Moreover, the plastic second and sixth lenselements are beneficial to reduce the cost and weight of the opticalimaging lens. Further, when the aperture stop is positioned before thefirst lens element, the object-side surface of the first lens element isformed as a convex surface, the image-side surface of the first lenselement is formed with a convex portion in a vicinity of a periphery ofthe first lens element, the image-side surface of the fourth lenselement is formed with a convex portion in the optical axis, theobject-side surface of the fifth lens element is formed with a convexportion in the optical axis, the object-side surface of the fifth lenselement is formed with a concave portion in a vicinity of a periphery ofthe fifth lens element and/or the image-side surface of the fifth lenselement is formed with a concave portion in a vicinity of the opticalaxis, the imaging quality is improved as the length of the opticalimaging lens is shortened. When all lens elements are made by plasticmaterial, the benefit of reduced production difficulty of the asphericalsurface, cost and weight is enhanced.

Reference is now made to Equation (1), which assists in sustainingbetter optical characteristics and production capability. Equation (1)is used for controlling the ratio of the parameter, T2, which has morepossibility to be shortened, to AAG below 4.3. When satisfying Equation(1), the shortened ratio of AAG is greater than that of T2 to facilitatethe shortening of the length of the optical imaging lens.

In another exemplary embodiment, some equation(s) of parameters, such asthose relating to the ratio among parameters could be taken intoconsideration. For example, T3, T6 and G34 could be controlled tosatisfy at least one of the equations as follows:(T3+T6)/G34≦4.5  Equation (2); or1.2≦(T3+T6)/G34≦4.5  Equation (2′); or

G34 and AAG could be controlled to satisfy the equation as follows:AAG/G34≦3  Equation (3); or

G12, G23, G45 and ALT could be controlled to satisfy the equation asfollows:6.5≦ALT/(G12+G23+G45)  Equation (4); or

T1, T4, T5 and G34 could be controlled to satisfy at least one of theequations as follows:(G34+T1+T5)/T4≦4  Equation (5); or(G34+T1+T5)/T4≦3  Equation (5′); or

T1, T4 and T5 could be controlled to satisfy the equation as follows:(T1+T5)/T4≦2.8  Equation (6); or

T2, G12, G23 and G45 could be controlled to satisfy the equation asfollows:(G12+G23+G45)/T2≦2.1  Equation (7); or

T4, T5 and G34 could be controlled to satisfy the equation as follows:(G34+T5)/T4≦2.2  Equation (8); or

G12, G23, G45, G56 and AAG could be controlled to satisfy the equationas follows:1.6≦AAG/(G12+G23+G45+G56)  Equation (9); or

G12, G23, G34 and G45 could be controlled to satisfy the equation asfollows:(G12+G23+G45)/G34≦2.1  Equation (10); or

T1, T5 and G34 could be controlled to satisfy the equation as follows:1.8≦(T1+T5)/G34≦6  Equation (11);or

T4, G12, G23 and G45 could be controlled to satisfy the equation asfollows:2.1≦T4/(G12+G23+G45)  Equation (12);or

T3, T4 and T6 could be controlled to satisfy the equation as follows:(T3+T6)/T4≦2.1  Equation (13); or

T2, T5 and G34 could be controlled to satisfy the equation as follows:2.5≦(G34+T5)/T2  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Reference is now made to Equations (2)/(2′), (3), (10) and (11).Considering the shortening of G34 is limited by the concave portion in avicinity of the optical axis formed on the image-side surface of thethird lens element and the concave portion in a vicinity of the opticalaxis formed on the object-side surface of the fourth lens element, hereall of the values of (T3+T6)/G34, AAG/G34, (G12+G23+G45)/G34 and(T1+T5)/G34 are suggested for an upper limit to satisfy Equations (2),(3), (10) and (11) to achieve a better configuration for the values ofT1, T3, T5, T6, AAG, G12, G23, G34 and G45 and better productioncapability and imaging quality. Preferably, the value of (T3+T6)/G34 issuggested to be within 1.2˜4.5 to satisfy Equation (2′), and whenEquation (2′) is satisfied, the small value of G34 facilitate theconfiguration of the thicknesses of the lens elements and air gaps.

Reference is now made to Equations (5)/(5′), (6), (8), (12) and (13).The shapes in a vicinity of the optical axis and a periphery of a lenselement are varied in light of the light path to meet the requirementsof imaging quality and demanded length of the optical imaging lens.Therefore, the thicknesses in a vicinity of the optical axis and aperiphery of a lens element are different, and this makes the lightincident in a lens element the more far from the optical axis requiresfor a refraction angle with the more degrees to focus on the imagingplane. In the present invention, T4 is required for a greater value dueto the concave portion in a vicinity of the optical axis formed on theobject-side surface of the fourth lens element, and this limits theshortened ratio of T4. Thus, here, the values of (G34+T1+T5)/T4,(T1+T5)/T4, (G34+T5)/T4 and (T3+T6)/T4 are suggested for an upper limitand the value of T4/(G12+G23+G45) is suggest for a lower limit tosatisfy Equations (5), (6), (8), (12) and (13) to effectively shortenthe length of the optical imaging lens and meanwhile sustain goodoptical imaging quality. Preferably, the value of (G34+T1+T5)/T4 issuggested to be smaller or equal to 3 to satisfy Equation (5′), and whenEquation (5′) is satisfied, the assembly and production processes arefacilitated.

Reference is now made to Equations (4) and (9). Considering that theconvex portion in a vicinity of the optical axis formed on theimage-side surface of the first lense element facilitate the shorteningof G12, the shortening of G23 and G45 faces no physical limitationaround the shapes of image-side surface of the second lens element, theobject-side surface of the third lens element, the image-side surface ofthe fourth lens element and the object-side surface of the fifth lenselement and the shortening of G56 is facilitated by the convex surfacein a vicinity of the optical axis formed on the object-side surface ofthe sixth lens element, G12, G23, G45 and G56 have more likely to beshortened to a relative small value. Therefore, here ALT/(G12+G23+G45)and AAG/(G12+G23+G45+G56) are suggested for a lower limit, to satisfyEquations (4) and (9).

Reference is now made to Equations (7) and (14). As mentioned above,considering that G12, G23 and G45 have more likely to be shortened to arelative small value to T2. Therefore, here (G12+G23+G45)/T2 issuggested for an upper limit, to satisfy Equation (7). However, asmentioned above, considering that the shortening of G34 faces somelimitation but the shortening of T5 is facilitated by the greatereffective radius of the fifth lens element, here (G34+T5)/T2 issuggested for a lower limit, to satisfy Equation (14). When Equations(7) and (14) are satisfied, all the parameters are configured better.

Preferably, the ration of AAG/T2 is between 1.5˜4.3, the ration of(T3+T6)/G34 is between 0.2˜4.5, the ration of AAG/G34 is between1.3˜3.0, the ration of ALT/(G12+G23+G45) is between 6.5˜25, the rationof (G34+T1+T5)/T4 is between 1˜4, the ration of (T1+T5)/T4 is between0.5˜2.8, the ration of (G12+G23+G45)/T2 is between 0.2˜2.1, the rationof (G34+T5)/T4 is between 0.3˜2.2, the ration of AAG/(G12+G23+G45+G56)is between 1.6˜3, the ration of (G12+G23+G45)/G34 is between 0.05˜2.1,the ration of T4/(G12+G23+G45) is between 2.1˜6, the ration of(T3+T6)/T4 is between 0.1˜2.1 and the ration of (G34+T5)/T2 is between2.5˜7.

In light of the unpredictability in an optical system, in the presentinvention, satisfying these equations listed above may preferablyshortening the length of the optical imaging lens, lowering thef-number, enlarging the shot angle, promoting the imaging quality and/orincreasing the yield in the assembly process.

When implementing example embodiments, more details about the convex orconcave surface could be incorporated for one specific lens element orbroadly for plural lens elements to enhance the control for the systemperformance and/or resolution, for example, the image-side surface ofthe sixth lens element may comprise a further convex portion in avicinity of a periphery of the sixth lens element. It is noted that thedetails listed here could be incorporated in example embodiments if noinconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characteristics and a shortened length. Reference isnow made to FIGS. 2-5. FIG. 2 illustrates an example cross-sectionalview of an optical imaging lens 1 having six lens elements of theoptical imaging lens according to a first example embodiment. FIG. 3shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens 1 according toan example embodiment. FIG. 4 illustrates an example table of opticaldata of each lens element of the optical imaging lens 1 according to anexample embodiment, in which f is used for representing EFL. FIG. 5depicts an example table of aspherical data of the optical imaging lens1 according to an example embodiment.

As shown in FIG. 2, the optical imaging lens 1 of the present embodimentcomprises, in order from an object side A1 to an image side A2 along anoptical axis, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140, afifth lens element 150 and a sixth lens element 160. A filtering unit170 and an image plane 180 of an image sensor are positioned at theimage side A2 of the optical lens 1. Each of the first, second, third,fourth, fifth, sixth lens elements 110, 120, 130, 140, 150, 160 and thefiltering unit 170 comprises an object-side surface111/121/131/141/151/161/171 facing toward the object side A1 and animage-side surface 112/122/132/142/152/162/172 facing toward the imageside A2. The example embodiment of the filtering unit 170 illustrated isan IR cut filter (infrared cut filter) positioned between the sixth lenselement 160 and an image plane 180. The filtering unit 170 selectivelyabsorbs light with specific wavelength from the light passing opticalimaging lens 1. For example, IR light is absorbed, and this willprohibit the IR light which is not seen by human eyes from producing animage on the image plane 180.

Please noted that during the normal operation of the optical imaginglens 1, the distance between any two adjacent lens elements of thefirst, second, third, fourth, fifth and sixth lens elements 110, 120,130, 140, 150, 160 is a unchanged value, i.e. the optical imaging lens 1is a prime lens.

Exemplary embodiments of each lens element of the optical imaging lens 1which may be constructed by plastic material will now be described withreference to the drawings.

An example embodiment of the first lens element 110 has positiverefracting power. The object-side surface 111 is a convex surfacecomprising a convex portion 1111 in a vicinity of the optical axis and aconvex portion 1112 in a vicinity of a periphery of the first lenselement 110. The image-side surface 112 is a convex surface comprising aconvex portion 1121 in a vicinity of the optical axis and a convexportion 1122 in a vicinity of the periphery of the first lens element110.

An example embodiment of the second lens element 120 has positiverefracting power. The object-side surface 121 comprises a concaveportion 1211 in a vicinity of the optical axis and a convex portion 1212in a vicinity of a periphery of the second lens element 120. Theimage-side surface 122 comprises a convex portion 1221 in a vicinity ofthe optical axis and a concave portion 1222 in a vicinity of theperiphery of the second lens element 120.

An example embodiment of the third lens element 130 has negativerefracting power. The object-side surface 131 comprises a convex portion1311 in a vicinity of the optical axis, a convex portion 1312 in avicinity of a periphery of the third lens element 130 and a concaveportion 1313 between the convex portion 1311 and the convex portion1312. The image-side surface 132 is a concave surface comprising aconcave portion 1321 in a vicinity of the optical axis and a concaveportion 1322 in a vicinity of the periphery of the third lens element130.

An example embodiment of the fourth lens element 140 has positiverefracting power. The object-side surface 141 is a concave surfacecomprising a concave portion 1411 in a vicinity of the optical axis anda concave portion 1412 in a vicinity of a periphery of the fourth lenselement 140. The image-side surface 142 is a convex surface comprising aconvex portion 1421 in a vicinity of the optical axis and a convexportion 1422 in a vicinity of the periphery of the fourth lens element140.

An example embodiment of the fifth lens element 150 has negativerefracting power. The object-side surface 151 comprises a convex portion1511 in a vicinity of the optical axis and a concave portion 1512 in avicinity of a periphery of the fifth lens element 150. The image-sidesurface 152 comprises a concave portion 1521 in a vicinity of theoptical axis and a convex portion 1522 in a vicinity of the periphery ofthe fifth lens element 150.

An example embodiment of the fifth lens element 160 has positiverefracting power. The object-side surface 161 comprises a convex portion1611 in a vicinity of the optical axis and a concave portion 1612 in avicinity of a periphery of the sixth lens element 160. The image-sidesurface 162 comprises a concave portion 1621 in a vicinity of theoptical axis and a convex portion 1622 in a vicinity of the periphery ofthe sixth lens element 160.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, 160, the filtering unit 170 and the image plane 180of the image sensor. For example, FIG. 1 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the sixthlens element 160, the air gap d6 existing between the sixth lens element160 and the filtering unit 170 and the air gap d7 existing between thefiltering unit 170 and the image plane 180 of the image sensor. However,in other embodiments, any of the aforesaid air gaps may or may notexist. For example, the profiles of opposite surfaces of any twoadjacent lens elements may correspond to each other, and in suchsituation, the air gap may not exist. The air gap d1 is denoted by G12,the air gap d2 is denoted by G23, the air gap d3 is denoted by G34, theair gap d4 is denoted by G45, the air gap d5 is denoted by G56 and thesum of d1, d2, d3, d4 and d5 is denoted by AAG.

FIG. 4 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment, and please refer toFIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G56,T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34,ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2,(G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34,T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 111 of the first lens element110 to the image plane 180 along the optical axis is 5.075 mm, and thelength of the optical imaging lens 1 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 1 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

The aspherical surfaces, including the object-side surface 111 and theimage-side surface 112 of the first lens element 110, the object-sidesurface 121 and the image-side surface 122 of the second lens element120, the object-side surface 131 and the image-side surface 132 of thethird lens element 130, the object-side surface 141 and the image-sidesurface 142 of the fourth lens element 140, the object-side surface 151and the image-side surface 152 of the fifth lens element 150, theobject-side surface 161 and the image-side surface 162 of the sixth lenselement 160 are all defined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}\;{a_{2\; i} \times Y^{2\; i}}}}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 5.

As illustrated in FIG. 3, longitudinal spherical aberration (a), thecurves of different wavelengths are closed to each other. Thisrepresents off-axis light with respect to these wavelengths is focusedaround an image point. From the vertical deviation of each curve showntherein, the offset of the off-axis light relative to the image point iswithin ±0.03 mm. Therefore, the present embodiment improves thelongitudinal spherical aberration with respect to different wavelengths.

Please refer to FIG. 3, astigmatism aberration in the sagittal direction(b) and astigmatism aberration in the tangential direction (c). Thefocus variation with respect to the three wavelengths in the whole fieldfalls within ±0.12 mm. This reflects the optical imaging lens 1 of thepresent embodiment eliminates aberration effectively. Additionally, theclosed curves represents dispersion is improved.

Please refer to FIG. 3, distortion aberration (d), which showing thevariation of the distortion aberration is within ±0.6%.

Therefore, the optical imaging lens 1 of the present embodiment showsgreat characteristics in the longitudinal spherical aberration,astigmatism in the sagittal direction, astigmatism in the tangentialdirection, and distortion aberration. According to above illustration,the optical imaging lens 1 of the example embodiment indeed achievesgreat optical performance and the length of the optical imaging lens 1is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 2 having six lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 8 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 9 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 231 for labeling theobject-side surface of the third lens element 230, reference number 232for labeling the image-side surface of the third lens element 230, etc.

As shown in FIG. 6, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 200, a first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240, a fifth lens element 250 and a sixth lens element 260.

The differences between the second embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the configuration of the concave/convexshape of the object-side surface 221 and the image-side surfaces 222,242, but the configuration of the positive/negative refracting power ofthe first, second, third, fourth, fifth and sixth lens elements 210,220, 230, 240, 250, 260 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 211, 231, 241, 251, 261facing to the object side A1 and the image-side surfaces 212, 232, 252,262 facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 221of the second lens element 220 is a concave surface comprising a concaveportion 2211 in a vicinity of the optical axis and a concave portion2212 in a vicinity of a periphery of the second lens element 220; theimage-side surface 222 of the second lens element 220 comprises a convexportion 2221 in a vicinity of the optical axis, a convex portion 2222 ina vicinity of a periphery of the second lens element 220 and a concaveportion 2223 between the convex portion 2221 and the convex portion2222; the image-side surface 242 of the fourth lens element 240comprises a convex portion 2421 in a vicinity of the optical axis and aconcave portion 2422 in a vicinity of a periphery of the fourth lenselement 240. Please refer to FIG. 8 for the optical characteristics ofeach lens elements in the optical imaging lens 2 the present embodiment,and please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL, AAG/T2,(T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4,(G12+G23+G45)/T2, (G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34,(T1+T5)/G34, T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of the presentembodiment.

The distance from the object-side surface 211 of the first lens element210 to the image plane 280 along the optical axis is 5.216 mm and thelength of the optical imaging lens 2 is shortened. Thus, the opticalimaging lens 2 is capable to provide excellent imaging quality forsmaller sized mobile devices.

As shown in FIG. 7, the optical imaging lens 2 of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), and distortion aberration (d). Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 2 is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 3 having six lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 331 for labeling the object-sidesurface of the third lens element 330, reference number 332 for labelingthe image-side surface of the third lens element 330, etc.

As shown in FIG. 10, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 300, a first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340, a fifth lens element 350 and a sixth lens element 360.

The differences between the third embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, positive/negative refracting power of thesixth lens element 360 and the configuration of the concave/convex shapeof surfaces, comprising the object-side surfaces 321, 331 and theimage-side surface 322, but the configuration of the positive/negativerefracting power of the first, second, third, fourth and fifth lenselements 310, 320, 330, 340, 350 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 311, 341, 351,361 facing to the object side A1 and the image-side surfaces 312, 332,342, 352, 362 facing to the image side A2, are similar to those in thefirst embodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 321of the second lens element 320 is a concave surface comprising a concaveportion 3211 in a vicinity of the optical axis and a concave portion3212 in a vicinity of a periphery of the second lens element 320; theimage-side surface 322 of the second lens element 320 is a convexsurface comprising a convex portion 3221 in a vicinity of the opticalaxis and a convex portion 3222 in a vicinity of a periphery of thesecond lens element 330; the object-side surface 331 of the third lenselement 330 comprises a convex portion 3311 in a vicinity of the opticalaxis and a concave portion 3312 in a vicinity of a periphery of thethird lens element 330; and the sixth lens element 360 has negativerefracting power. Please refer to FIG. 12 for the opticalcharacteristics of each lens elements in the optical imaging lens 3 ofthe present embodiment, and please refer to FIG. 38 for the values ofT1, G12, T2, G23, T3, G34, T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT,AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45),(G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2, (G34+T5)/T4,AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34, T4/(G12+G23+G45),(T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 311 of the first lens element310 to the image plane 380 along the optical axis is 5.222 mm and thelength of the optical imaging lens 3 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 3 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 11, the optical imaging lens 3 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in astigmatism in thesagittal direction (b) and astigmatism in the tangential direction (c),both of which are within ±0.10 mm, than that of the first embodiment toprovide a better imaging quality. Therefore, according to the aboveillustration, the optical imaging lens of the present embodiment indeedshows great optical performance and the length of the optical imaginglens 3 is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 4 having six lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 16 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 17 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 431 for labeling the object-side surface ofthe third lens element 430, reference number 432 for labeling theimage-side surface of the third lens element 430, etc.

As shown in FIG. 14, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 400, a first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 44, a fifth lens element 450 and a sixth lens element 460.

The differences between the fourth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the configuration of the concave/convexshape of the object-side surfaces 431, 441 and the image-side surface442, but the configuration of the positive/negative refracting power ofthe first, second, third, fourth, fifth and sixth lens elements 410,420, 430, 440, 450, 460 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 411, 421, 451, 461 facingto the object side A1 and the image-side surfaces 412, 422, 432, 452,462 facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 431of the third lens element 430 is a convex surface comprising a convexportion 4311 in a vicinity of the optical axis and a convex portion 4312in a vicinity of a periphery of the third lens element 430; theobject-side surface 441 of the fourth lens element 440 comprises aconcave portion 4411 in a vicinity of the optical axis and a convexportion 4412 in a vicinity of a periphery of the fourth lens element440; and the image-side surface 442 of the fourth lens element 440comprises a convex portion 4421 in a vicinity of the optical axis and aconcave portion 4422 in a vicinity of a periphery of the fourth lenselement 440. Please refer to FIG. 16 for the optical characteristics ofeach lens elements in the optical imaging lens 4 of the presentembodiment, please refer to FIG. 38 for the values of T1, G12, T2, G23,T3, G34, T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL,AAG/T2, (T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45), (G34+T1+T5)/T4,(T1+T5)/T4, (G12+G23+G45)/T2, (G34+T5)/T4, AAG/(G12+G23+G45+G56),(G12+G23+G45)/G34, (T1+T5)/G34, T4/(G12+G23+G45), (T3+T6)/T4 and(G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 411 of the first lens element410 to the image plane 480 along the optical axis is 5.119 mm and thelength of the optical imaging lens 4 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 4 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 15, the optical imaging lens 4 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in the longitudinalspherical aberration (a), which is within +0.025 mm, than that of thefirst embodiment to provide a better imaging quality. Therefore,according to the above illustration, the optical imaging lens of thepresent embodiment indeed shows great optical performance and the lengthof the optical imaging lens 4 is effectively shortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 5 having six lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 20 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 531 for labeling the object-side surface ofthe third lens element 530, reference number 532 for labeling theimage-side surface of the third lens element 530, etc.

As shown in FIG. 18, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 500, a first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540, a fifth lens element 550 and a sixth lens element 560.

The differences between the fifth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the configuration of the concave/convexshape of the object-side surfaces 521, 531, 541 and the image-sidesurfaces 522, 542, but the configuration of the positive/negativerefracting power of the first, second, third, fourth, fifth and sixthlens elements 510, 520, 530, 540, 550, 560 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces511, 551, 561 facing to the object side A1 and the image-side surfaces512, 532, 552, 562 facing to the image side A2, are similar to those inthe first embodiment. Here, for clearly showing the drawings of thepresent embodiment, only the surface shapes which are different fromthat in the first embodiment are labeled. Specifically, the object-sidesurface 521 of the second lens element 520 comprises a concave portion5211 in a vicinity of the optical axis, a concave portion 5212 in avicinity of a periphery of the second lens element 520 and a convexportion 5213 between the concave portion 5211 and the concave portion5212; the image-side surface 522 of the second lens element 520comprises a convex portion 5221 in a vicinity of the optical axis, aconvex portion 5222 in a vicinity of a periphery of the second lenselement 520 and a concave portion 5223 between the convex portion 5221and the convex portion 5222; the object-side surface 531 of the thirdlens element 530 comprises a convex portion 5311 in a vicinity of theoptical axis and a concave portion 5312 in a vicinity of a periphery ofthe third lens element 530; the object-side surface 541 of the fourthlens element 540 comprises a concave portion 5411 in a vicinity of theoptical axis and a convex portion 5412 in a vicinity of a periphery ofthe fourth lens element 540; and the image-side surface 542 of thefourth lens element 540 comprises a convex portion 5421 in a vicinity ofthe optical axis and a concave portion 5422 in a vicinity of a peripheryof the fourth lens element 540. Please refer to FIG. 20 for the opticalcharacteristics of each lens elements in the optical imaging lens 5 ofthe present embodiment, and please refer to FIG. 38 for the values ofT1, G12, T2, G23, T3, G34, T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT,AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45),(G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2, (G34+T5)/T4,AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34, T4/(G12+G23+G45),(T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 511 of the first lens element510 to the image plane 580 along the optical axis is 4.994 mm and thelength of the optical imaging lens 5 is shortened compared withconventional optical imaging lenses and even with the optical imaginglens 1 of the first embodiment. Thus, the optical imaging lens 5 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 19, the optical imaging lens 5 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 5 is effectively shortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 6 having six lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 631 for labeling the object-side surface ofthe third lens element 630, reference number 632 for labeling theimage-side surface of the third lens element 630, etc.

As shown in FIG. 22, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 600, a first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640, a fifth lens element 650 and a sixth lens element 660.

The differences between the sixth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the configuration of the concave/convexshape of the object-side surfaces 621, 631, 641 and the image-sidesurfaces 622, 632, 642, but the configuration of the positive/negativerefracting power of the first, second, third, fourth, fifth and sixthlens elements 610, 620, 630, 640, 650, 660 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces611, 651, 661 facing to the object side A1 and the image-side surfaces612, 652, 662 facing to the image side A2, are similar to those in thefirst embodiment. Specifically, the object-side surface 621 of thesecond lens element 620 comprises a concave portion 6211 in a vicinityof the optical axis, a concave portion 6212 in a vicinity of a peripheryof the second lens element 620 and a convex portion 6213 between theconcave portion 6211 and the concave potion 6212; the image-side surface622 of the second lens element 620 comprises a convex portion 6221 in avicinity of the optical axis, a convex portion 6222 in a vicinity of aperiphery of the second lens element 620 and a concave portion 6223between the convex portion 6221 and the convex portion 6222; theobject-side surface 631 of the third lens element 630 comprises a convexportion 6311 in a vicinity of the optical axis and a concave portion6312 in a vicinity of a periphery of the third lens element 630; theimage-side surface 632 of the third lens element 630 comprises a concaveportion 6321 in a vicinity of the optical axis and a convex portion 6322in a vicinity of a periphery of the third lens element 630; theobject-side surface 641 of the fourth lens element 640 comprises aconcave portion 6411 in a vicinity of the optical axis and a convexportion 6412 in a vicinity of a periphery of the fourth lens element640; and the image-side surface 642 of the fourth lens element 640comprises a convex portion 6421 in a vicinity of the optical axis and aconcave portion 6422 in a vicinity of a periphery of the fourth lenselement 640. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens elements in the optical imaging lens 6 ofthe present embodiment, and please refer to FIG. 38 for the values ofT1, G12, T2, G23, T3, G34, T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT,AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45),(G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2, (G34+T5)/T4,AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34, T4/(G12+G23+G45),(T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 611 of the first lens element610 to the image plane 680 along the optical axis is 5.119 mm and thelength of the optical imaging lens 6 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 6 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 23, the optical imaging lens 6 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in the longitudinalspherical aberration (a), which is within +0.020 mm, than that of thefirst embodiment to provide a better imaging quality. Therefore,according to the above illustration, the optical imaging lens of thepresent embodiment indeed shows great optical performance and the lengthof the optical imaging lens 6 is effectively shortened.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 7 having six lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 27 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 28 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 7, forexample, reference number 731 for labeling the object-side surface ofthe third lens element 730, reference number 732 for labeling theimage-side surface of the third lens element 730, etc.

As shown in FIG. 26, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 700, a first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740, a fifth lens element 750 and a sixth lens element 760.

The differences between the seventh embodiment and the first embodimentare the radius of curvature, thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the six lens element 760 and the configuration ofthe concave/convex shape of the object-side surfaces 721, 731 and theimage-side surface 722, but the configuration of the positive/negativerefracting power of the first, second, third, fourth and fifth lenselements 710, 720, 730, 740, 750 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 711, 741, 751,761 facing to the object side A1 and the image-side surfaces 712, 732,742, 752, 762 facing to the image side A2, are similar to those in thefirst embodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 721of the second lens element 720 is a concave surface comprising a concaveportion 7211 in a vicinity of the optical axis and a concave portion7212 in a vicinity of a periphery of the second lens element 720; theimage-side surface 722 of the second lens element 720 is a convexsurface comprising a convex portion 7221 in a vicinity of the opticalaxis and a convex portion 7222 in a vicinity of a periphery of thesecond lens element 720; the object-side surface 731 of the third lenselement 730 is a concave surface comprising a concave portion 7311 in avicinity of the optical axis and a concave portion 7312 in a vicinity ofa periphery of the third lens element 730; and the sixth lens element760 has negative refracting power. Please refer to FIG. 28 for theoptical characteristics of each lens elements in the optical imaginglens 7 of the present embodiment, and please refer to FIG. 38 for thevalues of T1, G12, T2, G23, T3, G34, T4, G45, T5, G56, T6, G6F, TF, GFP,EFL, ALT, AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34,ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2,(G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34,T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 711 of the first lens element710 to the image plane 780 along the optical axis is 5.358 mm and thelength of the optical imaging lens 7 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 7 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 27, the optical imaging lens 7 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in the astigmatism inthe sagittal direction (b) and astigmatism in the tangential direction(c), both of which are within ±0.06 mm, than that of the firstembodiment to provide a better imaging quality. Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 7 is effectively shortened.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 8 having six lenselements of the optical imaging lens according to a eighth exampleembodiment. FIG. 31 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 8, forexample, reference number 831 for labeling the object-side surface ofthe third lens element 830, reference number 832 for labeling theimage-side surface of the third lens element 830, etc.

As shown in FIG. 30, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 800, a first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840, a fifth lens element 850 and a sixth lens element 860.

The differences between the eighth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the six lens element 860 and the configuration ofthe concave/convex shape of the object-side surfaces 821, 831 and theimage-side surfaces 822, 842, but the configuration of thepositive/negative refracting power of the first, second, third, fourthand fifth lens elements 810, 820, 830, 840, 850 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces811, 841, 851, 861 facing to the object side A1 and the image-sidesurfaces 812, 832, 852, 862 facing to the image side A2, are similar tothose in the first embodiment. Here, for clearly showing the drawings ofthe present embodiment, only the surface shapes which are different fromthat in the first embodiment are labeled. Specifically, the object-sidesurface 821 of the second lens element 820 is a concave surfacecomprising a concave portion 8211 in a vicinity of the optical axis anda concave portion 8212 in a vicinity of a periphery of the second lenselement 820; the image-side surface 822 of the second lens element 820is a convex surface comprising a convex portion 8221 in a vicinity ofthe optical axis and a convex portion 8222 in a vicinity of a peripheryof the second lens element 820; the object-side surface 831 of the thirdlens element 830 is a concave surface comprising a concave portion 8311in a vicinity of the optical axis and a concave portion 8312 in avicinity of a periphery of the third lens element 830; the image-sidesurface 842 of the fourth lens element 840 comprises a convex portion8421 in a vicinity of the optical axis and a concave portion 8422 in avicinity of a periphery of the fourth lens element 840; and the sixthlens element 860 has negative refracting power. Please refer to FIG. 32for the optical characteristics of each lens elements in the opticalimaging lens 8 of the present embodiment, and please refer to FIG. 38for the values of T1, G12, T2, G23, T3, G34, T4, G45, T5, G56, T6, G6F,TF, GFP, EFL, ALT, AAG, BFL, TTL, AAG/T2, (T3+T6)/G34, AAG/G34,ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4, (G12+G23+G45)/T2,(G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34, (T1+T5)/G34,T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of the present embodiment.

The distance from the object-side surface 811 of the first lens element810 to the image plane 880 along the optical axis is 5.365 mm and thelength of the optical imaging lens 8 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 8 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 31, the optical imaging lens 8 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in the sagittaldirection (b) and astigmatism in the tangential direction (c), both ofwhich are within ±0.06 mm, than that of the first embodiment to providea better imaging quality. Therefore, according to the aboveillustration, the optical imaging lens of the present embodiment indeedshows great optical performance and the length of the optical imaginglens 8 is effectively shortened.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 9 having six lenselements of the optical imaging lens according to a ninth exampleembodiment. FIG. 35 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 9 according to the ninth embodiment. FIG. 36 shows an example tableof optical data of each lens element of the optical imaging lens 9according to the ninth example embodiment. FIG. 37 shows an exampletable of aspherical data of the optical imaging lens 9 according to theninth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 9, forexample, reference number 931 for labeling the object-side surface ofthe third lens element 930, reference number 932 for labeling theimage-side surface of the third lens element 930, etc.

As shown in FIG. 34, the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 900, a first lens element910, a second lens element 920, a third lens element 930, a fourth lenselement 940, a fifth lens element 950 and a sixth lens element 960.

The differences between the ninth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the six lens element 960 and the configuration ofthe concave/convex shape of the object-side surfaces 921, 931, 961 andthe image-side surface 922, but the configuration of thepositive/negative refracting power of the first, second, third, fourthand fifth lens elements 910, 920, 930, 940, 950 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces911, 941, 951 facing to the object side A1 and the image-side surfaces912, 932, 942, 952, 962 facing to the image side A2, are similar tothose in the first embodiment. Here, for clearly showing the drawings ofthe present embodiment, only the surface shapes which are different fromthat in the first embodiment are labeled. Specifically, the object-sidesurface 921 of the second lens element 920 is a concave surfacecomprising a concave portion 9211 in a vicinity of the optical axis anda concave portion 9212 in a vicinity of a periphery of the second lenselement 920; the image-side surface 922 of the second lens element 920is a convex surface comprising a convex portion 9221 in a vicinity ofthe optical axis and a convex portion 9222 in a vicinity of a peripheryof the second lens element 920; the object-side surface 931 of the thirdlens element 930 is a concave surface comprising a concave portion 9311in a vicinity of the optical axis and a concave portion 9312 in avicinity of a periphery of the third lens element 930; the sixth lenselement 960 has negative refracting power and the object-side surface961 of the sixth lens element 960 is a convex surface comprising aconvex portion 9611 in a vicinity of the optical axis and a convexportion 9612 in a vicinity of a periphery of the sixth lens element 960.Please refer to FIG. 36 for the optical characteristics of each lenselements in the optical imaging lens 9 of the present embodiment, andplease refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL, AAG/T2,(T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45), (G34+T1+T5)/T4, (T1+T5)/T4,(G12+G23+G45)/T2, (G34+T5)/T4, AAG/(G12+G23+G45+G56), (G12+G23+G45)/G34,(T1+T5)/G34, T4/(G12+G23+G45), (T3+T6)/T4 and (G34+T5)/T2 of the presentembodiment.

The distance from the object-side surface 911 of the first lens element910 to the image plane 980 along the optical axis is 5.354 mm and thelength of the optical imaging lens 9 is shortened compared withconventional optical imaging lenses. Thus, the optical imaging lens 9 iscapable to provide excellent imaging quality for smaller sized mobiledevices.

As shown in FIG. 35, the optical imaging lens 9 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d), and thepresent embodiment shows a better characteristics in the sagittaldirection (b) and astigmatism in the tangential direction (c), both ofwhich are within ±0.08 mm, than that of the first embodiment to providea better imaging quality. Therefore, according to the aboveillustration, the optical imaging lens of the present embodiment indeedshows great optical performance and the length of the optical imaginglens 9 is effectively shortened.

Please refer to FIG. 38, which shows the values of T1, G12, T2, G23, T3,G34, T4, G45, T5, G56, T6, G6F, TF, GFP, EFL, ALT, AAG, BFL, TTL,AAG/T2, (T3+T6)/G34, AAG/G34, ALT/(G12+G23+G45), (G34+T1+T5)/T4,(T1+T5)/T4, (G12+G23+G45)/T2, (G34+T5)/T4, AAG/(G12+G23+G45+G56),(G12+G23+G45)/G34, (T1+T5)/G34, T4/(G12+G23+G45), (T3+T6)/T4 and(G34+T5)/T2 of all nine embodiments, and it is clear that the opticalimaging lens of the present invention satisfy the Equations (1),(2)/(2′), (3), (4), (5)/(5′), (6), (7), (8), (9), (10), (11), (12), (13)and/or (14).

Reference is now made to FIG. 39, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 comprises a housing21 and a photography module 22 positioned in the housing 21. Examples ofthe mobile device 20 may be, but are not limited to, a mobile phone, acamera, a tablet computer, a personal digital assistant (PDA), etc.

As shown in FIG. 39, the photography module 22 may comprise an aforesaidoptical imaging lens with five lens elements, which is a prime lens andfor example the optical imaging lens 1 of the first embodiment, a lensbarrel 23 for positioning the optical imaging lens 1, a module housingunit 24 for positioning the lens barrel 23, a substrate 182 forpositioning the module housing unit 24, and an image sensor 181 which ispositioned at an image side of the optical imaging lens 1. The imageplane 180 is formed on the image sensor 181.

In some other example embodiments, the structure of the filtering unit170 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 181 used in the present embodiment isdirectly attached to a substrate 182 in the form of a chip on board(COB) package, and such package is different from traditional chip scalepackages (CSP) since COB package does not require a cover glass beforethe image sensor 181 in the optical imaging lens 1. Aforesaid exemplaryembodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The six lens elements 110, 120, 130, 140, 150, 160 are positioned in thelens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 comprises a lens backseat 2401 forpositioning the lens barrel 23 and an image sensor base 2406 positionedbetween the lens backseat 2401 and the image sensor 181. The lens barrel23 and the lens backseat 2401 are positioned along a same axis I-I′, andthe lens backseat 2401 is close to the outside of the lens barrel 23.The image sensor base 2406 is exemplarily close to the lens backseat2401 here. The image sensor base 2406 could be optionally omitted insome other embodiments of the present invention.

Because the length of the optical imaging lens 1 is merely 5.075 mm, thesize of the mobile device 20 may be quite small. Therefore, theembodiments described herein meet the market demand for smaller sizedproduct designs.

Reference is now made to FIG. 40, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprising a first seatunit 2402, a second seat unit 2403, a coil 2404 and a magnetic unit2405. The first seat unit 2402 is close to the outside of the lensbarrel 23, and positioned along an axis I-I′, and the second seat unit2403 is around the outside of the first seat unit 2402 and positionedalong with the axis I-I′. The coil 2404 is positioned between the firstseat unit 2402 and the inside of the second seat unit 2403. The magneticunit 2405 is positioned between the outside of the coil 2404 and theinside of the second seat unit 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein aredriven by the first seat unit 2402 for moving along the axis I-I′. Therest structure of the mobile device 20′ is similar to the mobile device20.

Similarly, because the length of the optical imaging lens 1, 5.075 mm,is shortened, the mobile device 20′ may be designed with a smaller sizeand meanwhile good optical performance is still provided. Therefore, thepresent embodiment meets the demand of small sized product design andthe request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling the detail structure of the lens elements and an inequality,the length of the optical imaging lens is effectively shortened andmeanwhile good optical characteristics are still provided.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequentially from anobject side to an image side along an optical axis, comprising first,second, third, fourth, fifth and sixth lens elements, each of saidfirst, second, third, fourth, fifth and sixth lens elements havingrefracting power, an object-side surface facing toward the object sideand an image-side surface facing toward the image side and a centralthickness defined along the optical axis, wherein: said image-sidesurface of said first lens comprises a convex portion in a vicinity ofthe optical axis; said second lens element is constructed by plasticmaterial; said third lens element has negative power, and saidimage-side surface of said third lens element comprises a concaveportion in a vicinity of the optical axis; said object-side surface ofsaid fourth lens element comprises a concave portion in a vicinity ofthe optical axis; said image-side surface of said fifth lens elementcomprises a convex portion in a vicinity of a periphery of the fifthlens element; said object-side surface of said sixth lens element whichis constructed by plastic material comprises a convex portion in avicinity of the optical axis, and said image-side surface thereofcomprises a concave portion in a vicinity of the optical axis and aconvex portion in a vicinity of a periphery of the sixth lens element;the optical imaging lens comprises no other lenses having refractingpower beyond the six lens elements; the central thickness of the secondlens element is represented by T2, a sum of all five air gaps from thefirst lens element to the sixth lens element along the optical axis isrepresented by AAG, and T2 and AAG satisfy the equation:AAG/T2≦4.3; and wherein twice an abbe number of said second lens elementis greater than the sum of an abbe number of said first lens element andan abbe number of said third lens element.
 2. The optical imaging lensaccording to claim 1, wherein the central thickness of the third lenselement is represented by T3, the central thickness of the sixth lenselement is represented by T6, an air gap between the third lens elementand the fourth lens element along the optical axis is represented byG34, and T3, T6 and G34 satisfy the equation:(T3+T6)/G34≦4.5.
 3. The optical imaging lens according to claim 2,wherein G34 and AAG satisfy the equation:AAG/G34≦3.
 4. The optical imaging lens according to claim 3, wherein thecentral thickness of the fourth lens element is represented by T4, thecentral thickness of the fifth lens element is represented by T5, andT4, T5 and G34 satisfy the equation:(G34+T5)/T4≦2.2.
 5. The optical imaging lens according to claim 1,wherein the central thickness of the third lens element is representedby T3, the central thickness of the sixth lens element is represented byT6, an air gap between the third lens element and the fourth lenselement along the optical axis is represented by G34, and T3, T6 and G34satisfy the equation:1.2≦(T3+T6)/G34≦4.5.
 6. The optical imaging lens according to claim 5,wherein an air gap between the first lens element and the second lenselement along the optical axis is represented by G12, an air gap betweenthe second lens element and the third lens element along the opticalaxis is represented by G23, an air gap between the fourth lens elementand the fifth lens element along the optical axis is represented by G45,a sum of the central thicknesses of all six lens elements is representedby ALT, and G12, G23, G45 and ALT satisfy the equation:6.5≦ALT/(G12+G23+G45).
 7. The optical imaging lens according to claim 6,wherein the central thickness of the first lens element is representedby T1, the central thickness of the fourth lens element is representedby T4, the central thickness of the fifth lens element is represented byT5, and T1, T4, T5 and G34 satisfy the equation:(G34+T1+T5)/T4≦4.
 8. The optical imaging lens according to claim 6,wherein the central thickness of the first lens element is representedby T1, the central thickness of the fourth lens element is representedby T4, the central thickness of the fifth lens element is represented byT5, and T1, T4 and T5 satisfy the equation:(T1+T5)/T4≦2.8.
 9. The optical imaging lens according to claim 1,wherein an air gap between the first lens element and the second lenselement along the optical axis is represented by G12, an air gap betweenthe second lens element and the third lens element along the opticalaxis is represented by G23, an air gap between the fourth lens elementand the fifth lens element along the optical axis is represented by G45,and T2, G12, G23 and G45 satisfy the equation:(G12+G23+G45)/T2≦2.1.
 10. The optical imaging lens according to claim 9,wherein the central thickness of the first lens element is representedby T1, the central thickness of the fourth lens element is representedby T4, the central thickness of the fifth lens element is represented byT5, an air gap between the third lens element and the fourth lenselement along the optical axis is G34, and T1, T4, T5 and G34 satisfythe equation:(G34+T1+T5)/T4≦3.
 11. The optical imaging lens according to claim 1,wherein the central thickness of the fourth lens element is representedby T4, the central thickness of the fifth lens element is represented byT5, an air gap between the third lens element and the fourth lenselement along the optical axis is G34, and T4, T5 and G34 satisfy theequation:(G34+T5)/T4≦2.2.
 12. The optical imaging lens according to claim 11,wherein an air gap between the first lens element and the second lenselement along the optical axis is represented by G12, an air gap betweenthe second lens element and the third lens element along the opticalaxis is represented by G23, an air gap between the fourth lens elementand the fifth lens element along the optical axis is represented by G45,an air gap between the fifth lens element and the sixth lens elementalong the optical axis is represented by G56, and G12, G23, G45, G56 andAAG satisfy the equation:1.6≦AAG/(G12+G23+G45+G56).
 13. The optical imaging lens according toclaim 11, wherein an air gap between the first lens element and thesecond lens element along the optical axis is represented by G12, an airgap between the second lens element and the third lens element along theoptical axis is represented by G23, an air gap between the fourth lenselement and the fifth lens element along the optical axis is representedby G45, and G12, G23, G34 and G45 satisfy the equation:(G12+G23+G45)/G34≦2.1.
 14. The optical imaging lens according to claim1, wherein the central thickness of the first lens element isrepresented by T1, the central thickness of the fifth lens element isrepresented by T5, an air gap between the third lens element and thefourth lens element along the optical axis is G34, and T1, T5 and G34satisfy the equation:1.8≦(T1+T5)/G34≦6.
 15. The optical imaging lens according to claim 14,wherein the central thickness of the fourth lens element is representedby T4, an air gap between the first lens element and the second lenselement along the optical axis is represented by G12, an air gap betweenthe second lens element and the third lens element along the opticalaxis is represented by G23, an air gap between the fourth lens elementand the fifth lens element along the optical axis is represented by G45,and T4, G12, G23 and G45 satisfy the equation:2.1≦T4/(G12+G23+G45).
 16. The optical imaging lens according to claim 1,wherein the central thickness of the third lens element is representedby T3, the central thickness of the fourth lens element is representedby T4, the central thickness of the sixth lens element is represented byT6, and T3, T4 and T6 satisfy the equation:(T3+T6)/T4≦2.1.
 17. The optical imaging lens according to claim 16,wherein the central thickness of the fifth lens element is representedby T5, an air gap between the third lens element and the fourth lenselement along the optical axis is G34, and T2, T5 and G34 satisfy theequation:2.5≦(G34+T5)/T2.
 18. A mobile device, comprising: a housing; and aphotography module positioned in the housing and comprising: an opticalimaging lens, sequentially from an object side to an image side along anoptical axis, comprising an aperture stop, first, second, third, fourth,fifth and sixth lens elements, each of said first, second, third,fourth, fifth and sixth lens elements having refracting power, anobject-side surface facing toward the object side and an image-sidesurface facing toward the image side and a central thickness definedalong the optical axis, wherein: said image-side surface of said firstlens comprises a convex portion in a vicinity of the optical axis; saidsecond lens element is constructed by plastic material; said third lenselement has negative power, and said image-side surface of said thirdlens element comprises a concave portion in a vicinity of the opticalaxis; said object-side surface of said fourth lens element comprises aconcave portion in a vicinity of the optical axis; said image-sidesurface of said fifth lens element comprises a convex portion in avicinity of a periphery of the fifth lens element; said object-sidesurface of said sixth lens element which is constructed by plasticmaterial comprises a convex portion in a vicinity of the optical axis,and said image-side surface thereof comprises a concave portion in avicinity of the optical axis and a convex portion in a vicinity of aperiphery of the sixth lens element; the optical imaging lens comprisesno other lenses having refracting power beyond the six lens elements;the central thickness of the second lens element is represented by T2, asum of all five air gaps from the first lens element to the sixth lenselement along the optical axis is represented by AAG, and T2 and AAGsatisfy the equation:AAG/T2≦4.3; and wherein twice an abbe number of said second lens elementis greater than the sum of an abbe number of said first lens element andan abbe number of said third lens element; a lens barrel for positioningthe optical imaging lens; a module housing unit for positioning the lensbarrel; and an image sensor positioned at the image side of the opticalimaging lens.